After removing hand brake from car ( only 2 bolts plus cable), the rack and pawl are both accessible with a file to clean out / sharpen up.
The pawl is as soft as putty and on my car was very rounded at the bottom and the leading edge was slopping the wrong way. 30 seconds with the file cut the "saw tooth " you see below in and at least on the bench, it's much improved. ( sorry - forgot to photograph the before situation)

Tony